To enable face detection in all captured frames, we use a standard calibration process using checkerboards [1]}. For the checkerboard to be visible in all wavelength regimes, a manual approach is used when a sequence of frames is captured offline while the checkerboard is being lit with a bright halogen light. This makes the checkerboard pattern visible and detectable by all cameras which allows the standard calibration estimation process to be followed. The face can then be easily detected in the RGB space [2]} and the calculated transformation for each camera can be applied to detect the face in the remaining camera frames.
